Sunday, February 2, 2014
Technics sx-pr603 Digital Piano Repair: frequent lock ups, failure to turn on, intermittent problems and weirdness
This model of Technics Digital Piano (sx-pr603) suffers from failing lead free solder around the IC's on the main board. Over time, the board heats and cools repeatedly and flexes, eventually cracking the microscopic connections between the surface mount IC's and the main board.
This causes lock ups, failure to turn on, and all kinds of strangeness with the unit.
It IS fixable, and we can fix them here at Offbeat Electronics, however be forewarned that the job generally costs about 250.00, and sometimes a few touch ups are necessary to keep the board running smoothly, in the first few weeks to a month or two after the repair (which are provided free of charge, of course). However, we have repaired these 100% of the time.
Repair consists of reflowing and adding solder around every one of the surface mount IC's. Also, I prefer to move the power transistors and related resistors off of that circuit board and to a separate heat sink, which I mount in the case.
I move them because I feel that the presence of those transistors and resistors introduces a tremendous amount of heat to the circuit board, and exacerbates the issues with the solder. Between reflowing the solder on that board, and removing the hot components from the board, full working order can be reached... I think this is a great sounding instrument, when it works, and worth preserving.